Secondary flows of viscoelastic fluids in serpentine microchannels

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Lucie Ducloué (Autor) Outra; Laura Casanellas (Autor) Outra; Simon J. Haward (Autor) Outra; Robert J. Poole (Autor) Outra; Manuel A. Alves (Autor) FEUP; Sandra Lerouge (Autor) Outra; Amy Q. Shen (Autor) Outra; Anke Lindner (Autor) Outra

Revista

Título: Microfluidics and Nanofluidics

Vol. 23 Nº 3

Páginas: 1-10

ISSN: 1613-4982

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 0 Citações

Scopus

Outras Informações

ID Authenticus: P-00Q-6WD

DOI: 10.1007/s10404-019-2195-0

Abstract (EN): Secondary flows are ubiquitous in channel flows, where small velocity components perpendicular to the main velocity appear due to the complexity of the channel geometry and/or that of the flow itself such as from inertial or non-Newtonian effects. We investigate here the inertialess secondary flow of viscoelastic fluids in curved microchannels of rectangular cross-section and constant but alternating curvature: the so-called serpentine channel geometry. Numerical calculations (Poole et al. J Non-Newton Fluid Mech 201:10-16, 2013) have shown that in this geometry, in the absence of elastic instabilities, a steady secondary flow develops that takes the shape of two counter-rotating vortices in the plane of the channel cross-section. We present the first experimental visualization evidence andcharacterisation of these steady secondary flows, using the complementary techniquesof quantitative microparticle image velocimetry in the centreplane of the channel, and confocal visualisation of dye-stream transport in the cross-sectional plane. We show that the measured streamlines and the relative velocity magnitude of the secondary flows are in qualitative agreement with the numerical results. In addition to our techniques being broadly applicable to the characterisation of three-dimensional flow structures in microchannels, our results are important for understanding the onset of instability in serpentine viscoelastic flows.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10